Eventual Consistency Today: Limitations, Extensions, and Beyond - ACM Queue



Eventual Consistency Today: Limitations, Extensions, and Beyond - ACM Queue

How eventual is eventual consistency? If the scores of system architects advocating eventual consistency are any indication, eventual consistency seems to work "well enough" in practice. How is this possible when it provides such weak guarantees? New prediction and measurement techniques allow system architects to quantify the behavior of real-world eventually consistent systems. When verified via measurement, these systems appear strongly consistent most of the time.

How should one program under eventual consistency? How can system architects cope with the lack of guarantees provided by eventual consistency? How do they program without strong ordering guarantees? New research enables system architects to deal with inconsistencies, either via external compensation outside of the system or by limiting themselves to data structures that avoid inconsistencies altogether.


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